Suppose you have 100ms audio latency and no wait time. Then, natural pause will trigger response immediately but you won't notice it has started until after ~200ms (round-trip time). Twice as annoying.
You can write unambiguous (UB-free) code and the compiler's output will be deterministic. There will even be a spec that explains how your source maps to your program's behavior. LLM has neither.
Also, if you need to control performance, you still need to know how CPU cache and branch prediction works, both of which exists at the abstraction level of assembly.
I used floating timestamps as some kind of an identity. If there is ever a conflict, I just increase it by 1 ulp until it doesn't collide with anything. Sorry.
This is called a hardware abstraction layer, not OS.
https://en.wikipedia.org/wiki/Hardware_abstraction